package com.net.shop.car.manager.ui.view;

import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;

public class GuaGuaLeGallery extends Gallery {

	private Camera mCamera = new Camera();
	private int mCoveflowCenter;
	private int mMaxRotationAngle = 60;
	int childCenter;
	private int mMaxZoom = -40;
	int lastPosition;
	float i;
	float j;
	Context context;

	@SuppressWarnings("deprecation")
	public GuaGuaLeGallery(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		this.setStaticTransformationsEnabled(true);
	}

	@SuppressWarnings("deprecation")
	public GuaGuaLeGallery(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.setStaticTransformationsEnabled(true);
	}

	@SuppressWarnings("deprecation")
	public GuaGuaLeGallery(Context context) {
		super(context);
		this.setStaticTransformationsEnabled(true);
		this.context = context;

	}

	/**
	 * 
	 * @return 返回屏幕中心距 以px为单位
	 */
	private int getCenterOfCoverflow() {
		int center = (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
				+ getPaddingLeft();
		System.out.println("===========================>中心距" + center);
		return center;
	}

	/**
	 * 
	 * @param view
	 * @return 返回view的中心在屏幕绝对坐标值
	 */
	private static int getCenterOfView(View view) {
		return view.getLeft() + view.getWidth() / 2;
	}
	  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
	        mCoveflowCenter = getCenterOfCoverflow();
	        super.onSizeChanged(w, h, oldw, oldh);
	    }
	    
	    
	  
	   //控制gallery中每个图片的旋转(重写的gallery中方法)
	    protected boolean getChildStaticTransformation(View child, Transformation t) {  
	        //取得当前子view的半径值
	        final int childCenter = getCenterOfView(child);
	        
	        final int childWidth = child.getWidth();
	        //旋转角度
	        int rotationAngle = 0;
	        //重置转换状态
	        t.clear();
	        //设置转换类型
	        t.setTransformationType(Transformation.TYPE_MATRIX);
	        //如果图片位于中心位置不需要进行旋转
	        if (childCenter == mCoveflowCenter) {
	            transformImageBitmap((ImageView) child, t, 0);
	        } else {
	            //根据图片在gallery中的位置来计算图片的旋转角度
	            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
	            System.out.println("rotationAngle:" +rotationAngle);
	            //如果旋转角度绝对值大于最大旋转角度返回（-mMaxRotationAngle或mMaxRotationAngle;）
	            if (Math.abs(rotationAngle) > mMaxRotationAngle) {
	                rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
	            }
	            transformImageBitmap((ImageView) child, t, rotationAngle);
	        }
	        return true;
	    }
	    
	    /**
	     * 
	     */
	    
	    private void transformImageBitmap(ImageView child, Transformation t,
	                    int rotationAngle) {
	        //对效果进行保存
	        mCamera.save();
	        final Matrix imageMatrix = t.getMatrix();
	        //图片高度
	        final int imageHeight = child.getLayoutParams().height;
	        //图片宽度
	        final int imageWidth = child.getLayoutParams().width;
	       
	        //返回旋转角度的绝对值
	        final int rotation = Math.abs(rotationAngle);
	        float zoomAmount= (float) (mMaxZoom + (rotation * 1.5));;
	        // 在Z轴上正向移动camera的视角，实际效果为放大图片。
	        // 如果在Y轴上移动，则图片上下移动；X轴上对应图片左右移动。
	        // As the angle of the view gets less, zoom in
	        if (rotation<30) {
	            mCamera.translate(0, zoomAmount, -320);
	        }else if(rotation>30&&rotation<40){
	        	 mCamera.translate(0, zoomAmount, 0);
	        }else if(rotation==mMaxRotationAngle){
	        	 mCamera.translate(0, zoomAmount, 100);
	        }
	        // 在Y轴上旋转，对应图片竖向向里翻转。
	        // 如果在X轴上旋转，则对应图片横向向里翻转。
	       
	        mCamera.getMatrix(imageMatrix);
	        imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
	        imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
	        mCamera.restore();
	    }

	@Override
	public void setSpacing(int spacing) {
		super.setSpacing(-80);
	}

	@Override
	protected int getChildDrawingOrder(int childCount, int i) {
		// TODO Auto-generated method stub

		int mFirstPosition = getFirstVisiblePosition();

		int mSelectedPosition = getSelectedItemPosition();

		int selectedIndex = mSelectedPosition - mFirstPosition;
		if (i == 0) {
			lastPosition = 0;
		}

		int ret = 0;

		if (selectedIndex < 0) {
			return i;
		}

		if (i == childCount - 1) {

			ret = selectedIndex;
		} else if (i >= selectedIndex) {

			lastPosition++;

			ret = childCount - lastPosition;

		} else {

			ret = i;

		}
		return ret;

	}

}
